I have used Wolf with no problems but, I did not shoot more than 30-50 rounds per session and cleaned the chamber with a brush designed for the AR's and a top quality solvent extensivley after wards. What I did learn too was the early made Wolf because the cases are steel had a shellac or varnish coating on the cases, which after the chamber reached high temps this coating would melt off the cases and gum up the action/chamber thereby causing feed/extraction issues. I do beleve that coating was changed or eliminated in later production runs of the ammo. Also some AR's/clones have tighter chamber tolerances that can be a factor. Tom L